Eroare de compilare: user.cpp: In function ‘std::string toString(unsigned int)’: user.cpp:14:2: error: ‘vector’ was not declared in this scope vector<char> v; ^ user.cpp:14:9: error: expected primary-expression before ‘char’ vector<char> v; ^ user.cpp:14:9: error: expected ‘;’ before ‘char’ user.cpp:18:3: error: ‘v’ was not declared in this scope v.push_back (c); ^ user.cpp:20:17: error: ‘v’ was not declared in this scope return string (v.begin (), v.end ()); ^ user.cpp: In function ‘int main()’: user.cpp:38:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned i = 0; i <= n; i++) ^ user.cpp: In function ‘std::string toString(unsigned int)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^